Sentence examples for twilight periods from inspiring English sources

At the poles, both day and night are theoretically six months long, though the actual periods of light and dark are modified by the twilight periods.

Black flies and no-see-ums, which are closely related to mosquitoes, are active only during the day or twilight periods.

This means that the formation of hydrogen radicals that destroy odd oxygen is significantly reduced but there is still some atomic oxygen production that permits ozone formation during the short twilight periods close to the polar night terminator.

"Due to the behaviour of wallabies who are active during twilight periods, and lie low during the day, sightings have been few and far between, but we have been acting on information as it comes in to try and recover him," added Rake in his comments to the Press Association.

The adult moths are green with orange or red hind wings and fly very quickly during the day or twilight periods (but not night), hovering like miniature hummingbirds to take nectar from flowers.

When astronomical twilight is included, the bright period starts on March 7th and ends on October 8th South of the Arctic Circle, there is no mid-night sun, but very long days and twilight periods occur in the summer.

Mrs Merkel's twilight period clearly now runs that risk, with major consequences for Germany and Europe.

Although "night" theoretically is six months long at the geographic pole, one month of this actually is a twilight period.

His late-career surge, a gratifyingly long goodbye, defies preconceptions of what an artist's twilight period should be.

This should be taken into account in problems of radiative budget estimation and remote sensing of the atmosphere exploiting the twilight period.

These small table bells (acc. 1155-1177) all date from around the turn of the 20th century, at the close of the Twilight period of Old China.